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nouna structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it
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nouncontrol consisting of a mechanical device for controlling the flow of a fluidtype of:
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noundevice in a brass wind instrument for varying the length of the air column to alter the pitch of a tonetype of:part of:
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nounone of the paired hinged shells of certain molluscs and of brachiopodstype of:
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nounthe entire one-piece shell of a snail and certain other molluscstype of:
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